text: import * as dynamoDbLib from './libs/dynamodb-lib';
  import { success, failure } from './libs/response-lib';
  
  export async function main(event, context) {
    const params = {
      TableName: process.env.tableName,
      // 'KeyConditionExpression' defines the condition for the query
      // - 'userId = :userId': only return items with matching 'userId'
      // partition key
      // 'ExpressionAttributeValues' defines the value in the condition
      // - ':userId': defines 'userId' to be Identity Pool identity id
      // of the authenticated user
      KeyConditionExpression: 'userId = :userId',
      ExpressionAttributeValues: {
        ':userId': event.requestContext.identity.cognitoIdentityId
      }
    };
    try {
      const result = await dynamoDbLib.call('query', params);
      // Return the matching list of items in response body;
      return success(result.Items);
    } catch (e) {
      return failure({ status: false });
    }
  }
  